Tone-purifier.



c. PL..MAnsH-ALL.

TONEPURI'FIER.

APPLICATIQN'FILED NOLvZS. i916.

1 ,23 1 ,277, .Patented June 26, 1917.

2 SHEETS-SHEET l.

WITNESS JN VEN TQR.

C. P. MARSHALL.

TONE PURIFIER.

' APPLICATION FILED IIov.23` 1915.

Patented June 26, 1917.

2 SHEETS-SHEET 2.

)N VEN TOR. CHAaw/,OMPML 'A Tron/v5 Y.'

CHARLES l. MARSHALL, OIE WATERTWN, NEW YORK.

TONE-PURIFIER.

'To all fui/tom t may concern.'

and the like.

Be it known that l, CHARLES P. MARSHALL, a citizen of the United States,residing at lVatertown, in the county of J eerson and State of New York,have invented certain new and useful Improvements in ll`one- Purifiers,of which the following is a speciiication. Y

vThis invention relates to tone purifiers designed for phonographs,talking machines `The invention relates particularly to improvements 1nthe class of devices shown and described in my United States Patent N0.1199197, dated September 26, 1916.

y The principal object of the present invention is to increase thesymphonic quality and degree and to improve the acoustic quality anddegree of tone purifiers of the class. A furth'er object is to provide ahollow resonator or acoustic chamber substantially in the form of atruncated cone having one flat side. A further object is to extend thefiat side of the resonator more or less in one or more directions, forvarying the symphonic quality and degree of the i purifier. A furtherobject is to provide various shaped` tone and sound modifying openingsin different parts of the body for varying the degree and quality oftone and sound. A further object is to provide a dome top for the bodywhich mav vary in size and shape, for improving the acoustic and alsothe symphonic quality and degree of the purifier. And a further objectis to provide sound modifying tension cords or snares which may beapplied to either the body or the wings.

I attain these objects by the means set forth in the detaileddescription which follows, and as illustrated in the accompanyingldrawings, in WhichvFigure l is a top plan view of the purifier embodyingmy improvements. Fig. 2 is a front side elevation of the same mounted Iupon a well-known reproducer. Fig. 3 is an i end elevation of the same.Fig. 4 is a modi- Specification of Letters Yatent.

Application lcd November 23, 19i6. Serial No. 133,074.

top and a hollow sounding board. Figs. 9 and l0 are respectively a topplan and a side elevation of a modified sounding board.

In the drawings, 2 represents generally the reproducer of a talkingmachine, including the annular rim 3, the. diaphragm 4, the vibrationbar 5, and the needle G, all of which parts may be of the usual styleorv make.

7 represents the hollow resonator comprising the body of the tonepurifier, having one open end 7', which faces the diaphragm 4 and restsupon or engages the rim 3. The body 7 is preferably larger at its topthan at its bottom, and its top end is closed by a dome 8, whose eavespreferably extend beyond the walls of the body, as shown in Figs. l, 2,3 and 6. The domes, however, may extend more or less beyond the bodies,for varying the quality and degree of resonance, The doines are employedparticularly for more perfectly focusing the reflected resonated soundwaves upon the diaphragm. 9 represents a number of tone and soundmodifying openings, which may be disposed in different parts of thehollow body 7, but these openings are preferably positioned at theopposite sides, as atthe intersection of the body with the flat side 10.

'as well as at the rear extremity of the dome 8, as shown at 9. v In thepresent case,vthe flat side 10 is preferably continued in oppositedirections beyond the body or bell 7,

for providing wings or planes, as lO-10", preferably of untqual size andvarying shapes. By thus extending the fiat side or sounding board of theresonator, the symphonic quality and degree of the instrument is varied,thereby rendering the reproductions of the records more clear andperfect than heretofore. The wings 1010 may be arranged in the sameplane as the fiat portion 10, or Ithey may be curved or otherwise bent,as shown in Figs. 9 and l0. This curving of the wings tends to steadythe whole sound board, thus controlling the vibrations to a betterdegree and giving to the tones added clarity and brilliancy. The bell orbody 7 is preferably in direct and positive contact with the rim 3 ofthe sound box or transmitter 2, so that the vibrations of theV said rimare communicated to the bell, and particularly to the flat side l0 andthe wings 10-l0, where the vibrations are symphoniously propagated,after which they are resonated by the acoustic properties er the hollowbody 7. The tones and sounds of the instrument are still furtherimproved' as to clarity and tone color by providing one or more tensioncords as 12--12, which are applied to the body, as well' as to differentparts of the extended sounding board. These tension cords may consist ofany suitable material, but they are preferably made in whole or in partof exible or elastic material. In Figs. 2 and 6 are shown a numloer ofthe tension cords applied to the different parts of the body 7, as wellas to the position into which the cords are placed has a differentmodifying effect. These tension cords tend to steady both the vibrationbar and the resonator, as well as the wings 10-10. The principalfunction of th`e cords 12 and 12 is to restrain the vibrations of theparts and thereby vary the symphonic and acoustic resonance, producingvarious pleasing qualities of'clarity and tone color.

ln Fig. l is shown a relatively large bell shaped resonator 7 a, havinga flat top Sa and an elongated laterally extended sounding board 10a lnFig. is shown a smaller conical resonator 7 havinga simili dome top 8"without eaves and a relatively short sounding board 10". ln this viewthe resonator is shown supported on the transmitter 2 by means of 14;. Ifind that to apply my resonator. to certain makes of reproducers it isnecessary to provide the legs referred to. Besides by thus restrictingthe metallic connection between the resonator and the casing 2materially modifies or changes the purifying effect.

ln Fig. 7 is shown a fiat top resonator to which is applied a modifiedsounding board l0, wherein the extended wings are substantially the samesize and shape, and in which l provide tone and sound modifying riln 15and bars 16, which Vary the quality and degree of resonance.

ln Fig; 8 is shown a resonator 0r bell 7r1 having a dome top 8d, whichslightly 'overhangssthe walls of the bell, and a tone or sound modifyingchamber 17 arranged within the extended sounding board 10", for stillfurther varying the quality and degree of resonance.

ln Figs. Al and Q are shown rubber or other tone modifying masses orweights 20. which are preferably fastened to the wings ily-10 by screwsQ1, the latter passing through perforations 22 in said wings. The masses20 may be disposed in different positions on the wings, as indicated bydotted lines in Fig. 2 for giving rigidity to and steadying thedifferent portions of said Wings. By the use of the masses 20 thevibrations of the different portions of the sounding board 10-10 Ymay bevaried-restrained, for modifying the symphonic quality and degree of thetones and sounds.

In operation, the vibrations of the needle 6 are transmitted to thediaphragm 4 and from the diaphragm into the casing of the soundbox ofthe reproducer 2, the latter transmitting them into the walls of thepurifier 7. Thusthe vibrations permeate the en-z tire structure of thepurifie and' are symphoniously propagated largely throughout theextended flat side, and also throughout the extended top or dome 8, theyare then resonated by the acoustic properties of the purifier 7 andreflected on to the diaphragm, which receives them and transmits them asimproved, puried tones and sounds, 'synehronously with the regular tonesand sounds of the diaphragm. This results in the tones and sounds in themusic' and speech being enriched, strengthened and purified by beingmultiplied and given a wider range to spread and develop throughout theample size of the extended flat side and also by the improved acousticquality of the purifier, partiqularly the enlarged top ol the part i',as herein shown and described. l"urtherrnore.y by this improvement thetones are enriched by largely overcoming or col oring the raw nasal noteof the diaphragm by the increased, rich, fundamental tone of. thepurifier. Improved articulation and enunciation are effected by theimproved acoustic qualities of the purifier, which is attained by thepeculiar proportioning of the body 7, and by better focusing thereflected sounds, upon the diaphragm by means of the dome 8, as well asby the provision and arrangement of the various speaking openings f) andil.

Having thus described my invention, what I claim is new and desire tosecure by Letters Patent, is

I. tone purier comprising a hollow body having one open'end and oneclosed end, the closed end comprising a dome haring projecting eaves,and a sounding board comprising one side ol said body and havi bodyhaving a reduced open end and an enlarged closed end formed dome-shaped,a sounding board comprising one side of said body having wings extendinglaterally beyond said body, and a plurality of tension cords secured tosaid body and also to said wings. l

4. A combined acoustic and symphonic tone purifier, comprising a hollowbody having one fiat sidecomprising a sounding board, the ends of saidboard extending laterally beyond the body, and said body having tone andsound modifying openings adjacent said wings.

A combined acoustic and symphonic tone purifier comprising a hollow bodyhaving an extended dome-shaped top and sound modifying openings, and asounding board comprising one side of said body and having wingsextending laterally beyond said body. i

6. A tone purifier comprising a hollow body having one flat side whichextends in opposite directions beyond the body, said body having anextended dome-shaped top and tone-and-soimd modifying openingspositioned at the intersection of the body with the flat side. I

7. The combination with the diaphragm and the casing of a reproducer, ofa symphonic Vresonator comprising an extended sounding board, and a bodysupporting and conducting the vibrations from the casing to the soundingboard, said body having an acoustic chamber receiving sound waves fromthe diaphragm.

S. The combination with a reproducer including a diaphragm, of asymphonic resonator comprising an extended sound board, and a hollowbody supporting said sound board having an acoustic chamber providediwith a dome'top adapted to focus sound waves upon the diaphragm.

9. The combination with a reproducer including a casing, a diaphragm anda needle bar, ofa hollow body, the lower end thereof being open andengaging said casing, the upper end of said bodyclosed by a dome, asounding board disposed at one side of said body having wings extendinglaterally from Vsaid'body, and saidv body having a plurality ofsound-modifying openings disposed at the intersection of the body andthe sounding board.

10. The combination with a reproducer, of a hollow body having acontracted lower end engaging the reproducer, its top end bcing enlargedand surmounted by ay dome, one side of said5 body being flat andprovided with laterally extending wings, and said body having aplurality of tone and sound-modifying openings disposed at thevintersection of the body with said wings and between the dome and thesaid flat side.

11. The combination with a reproduccicomprising a casing and adiaphragm, of the hollow body having an open end in cngagement withsaidycasing and facingsaid diaphragm, the top of said body beingenlarged and dome-shaped, and an elongated sounding board supported bysaid body and having wings extehding laterally in oppo.- site directionsbeyond said body. ,Y

l2. A tone purifier consisting of a hollow acoustic body having one flatside comprising a sounding board, the ends of said board extendinglaterally beyond thc body, and a plurality of sound' and tone modifyingmasses mounted on the said sounding board.

In testimony' whereof I aiiix my signature.

CHARLES P. MARSHALL.

